WO2020250688A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2020250688A1
WO2020250688A1 PCT/JP2020/021000 JP2020021000W WO2020250688A1 WO 2020250688 A1 WO2020250688 A1 WO 2020250688A1 JP 2020021000 W JP2020021000 W JP 2020021000W WO 2020250688 A1 WO2020250688 A1 WO 2020250688A1
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WO
WIPO (PCT)
Prior art keywords
tread
sipe
width
circumferential
groove
Prior art date
Application number
PCT/JP2020/021000
Other languages
English (en)
Japanese (ja)
Inventor
達也 冨田
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Priority to CN202080040123.1A priority Critical patent/CN113891808B/zh
Priority to US17/612,523 priority patent/US20220227176A1/en
Priority to EP20822945.0A priority patent/EP3984770A4/fr
Publication of WO2020250688A1 publication Critical patent/WO2020250688A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
    • B60C11/0058—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers with different cap rubber layers in the axial direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/032—Patterns comprising isolated recesses
    • B60C11/0323—Patterns comprising isolated recesses tread comprising channels under the tread surface, e.g. for draining water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1272—Width of the sipe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B60C11/1346—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls covered by a rubber different from the tread rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0025—Modulus or tan delta
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0353—Circumferential grooves characterised by width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0341—Circumferential grooves
    • B60C2011/0355—Circumferential grooves characterised by depth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
    • B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0381—Blind or isolated grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C2011/0337—Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339—Grooves
    • B60C2011/0381—Blind or isolated grooves
    • B60C2011/0383—Blind or isolated grooves at the centre of the tread
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • the present invention relates to a pneumatic tire.
  • Patent Document 1 As a technique for improving the drainage property of a tire when wear progresses, it has been proposed to provide a groove on the tread tread surface of the tire so that the groove width becomes large when wear progresses (for example, Patent Document 1).
  • an object of the present invention is to provide a pneumatic tire capable of improving drainage while suppressing the occurrence of uneven wear at the time of progress of wear.
  • the gist structure of the present invention is as follows. (1) On the tread tread, between a plurality of circumferential main grooves extending in the tread circumferential direction and the circumferential main grooves adjacent to the tread width direction among the plurality of circumferential main grooves, or in the circumferential direction.
  • a pneumatic tire having a plurality of land areas partitioned by a main groove and a tread end.
  • the land portion has a plurality of widthwise grooves extending in the tread width direction.
  • the width direction groove has a widening portion on the groove bottom side in which the groove width is larger than that on the tread tread side.
  • the groove width of the widened portion of the width direction groove is 2.5 times or more the opening width of the tread tread.
  • the storage elastic modulus of the first tread rubber which is a groove wall surface layer portion that is partitioned by the widening portion and covers at least a part of the widening portion, is determined by the first tread rubber in the tire radial region including at least the reference depth position.
  • a pneumatic tire characterized in that it is greater than the storage modulus of the second tread rubber in the area surrounding the tread rubber.
  • a pneumatic tire having a plurality of land areas partitioned by a main groove and a tread end.
  • the land portion has a plurality of widthwise sipes extending in the width direction of the tread.
  • the width direction sipe has a widening portion on the sipe bottom side in which the sipe width is larger than that on the tread tread side.
  • the sipe width of the widened portion of the width direction sipe is 2.5 times or more the opening width of the tread tread.
  • the storage elastic modulus of the first tread rubber which is a groove wall surface layer portion that is partitioned by the widening portion and covers at least a part of the widening portion, is determined by the first tread rubber in the tire radial region including at least the reference depth position.
  • a pneumatic tire characterized in that it is greater than the storage modulus of the second tread rubber in the area surrounding the tread rubber.
  • a pneumatic tire having a plurality of land areas partitioned by a main groove and a tread end.
  • the land portion has one or more circumferential sipes extending in the circumferential direction of the tread.
  • the circumferential sipe has a widening portion on the bottom side of the sipe whose sipe width is larger than that on the tread tread side.
  • the sipe width of the widened portion of the circumferential sipe is 2.5 times or more the opening width of the tread tread.
  • the storage elastic modulus of the first tread rubber which is a groove wall surface layer portion that is partitioned by the widening portion and covers at least a part of the widening portion, is determined by the first tread rubber in the tire radial region including at least the reference depth position.
  • a pneumatic tire characterized in that it is greater than the storage modulus of the second tread rubber in the area surrounding the tread rubber.
  • the "tread tread” is the entire tread circumferential direction of the tread surface that comes into contact with the road surface when a pneumatic tire is attached to the applicable rim, the specified internal pressure is applied, and the maximum load is applied. It refers to the aspect that extends.
  • the "circumferential main groove” means that the opening width of the tread tread is 1 when the tread extends in the circumferential direction, a pneumatic tire is attached to the applicable rim, the specified internal pressure is applied, and no load is applied. .5 mm or more.
  • the "tread end” means the outermost points on both sides of the tread tread in the tire width direction.
  • the "width direction groove” is defined as the opening width of the tread tread when the tread extends in the width direction, a pneumatic tire is attached to the applicable rim, the specified internal pressure is applied, and no load is applied. It means a tire of 0 mm or more.
  • the "width direction sipe” means that the opening width of the tread tread, which extends in the tread width direction, is such that a pneumatic tire is attached to the applicable rim, the specified internal pressure is applied, and no load is applied. Those less than 0 mm.
  • the “circumferential sipe” means that the opening width of the tread tread in a state where the tread extends in the circumferential direction, a pneumatic tire is attached to the applicable rim, the specified internal pressure is applied, and no load is applied, is 1. Those less than 5 mm.
  • the "storage elastic modulus” shall mean the one measured at a temperature of 25 ° C. in accordance with JIS K7244.
  • the "applicable rim” is an industrial standard that is effective in the area where the tire is produced and used.
  • JATMA Joint Automobile Tire Association
  • JATMA YEAR BOOK and in Europe, ETRTO (The European).
  • STANDARDS MANUAL of Tire and Rim Technical Organization
  • YEAR BOOK of TRA The Tire and Rim Association, Inc.
  • the size described as “FUTURE DEVELOPMENTS” in the ETRTO 2013 edition can be mentioned.
  • the size corresponds to the bead width of the tire. A rim with a wide width.
  • the “specified internal pressure” refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size / ply rating described in the above JATMA, etc., and has a size not described in the above industrial standard.
  • the “specified internal pressure” shall mean the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle equipped with tires.
  • the "maximum load” means a load corresponding to the above maximum load capacity.
  • the "maximum width tire radial position" when the "maximum width tire radial position" has a width in the tire radial direction, it means the outermost position in the tire radial direction of the region.
  • thickness t means the maximum thickness when the thickness is not constant.
  • the internal structure and the like of the pneumatic tire (hereinafter, also simply referred to as a tire) can be the same as that of the conventional one.
  • the tire may have a pair of bead portions, a pair of sidewall portions connected to the pair of bead portions, and a tread portion arranged between the pair of sidewall portions. ..
  • the tire may have a carcass straddling the pair of bead portions in a toroidal manner, and a belt arranged on the outer side of the crown portion of the carcass in the tire radial direction.
  • the dimensions and the like refer to the dimensions and the like when the tire is mounted on the applicable rim, the specified internal pressure is filled, and the load is not applied.
  • FIG. 1 is a development view schematically showing a tread pattern of a pneumatic tire according to an embodiment of the present invention.
  • the tire of this example has a plurality of tires (2a, 2b, 2c) extending in the tread circumferential direction (three in the illustrated example) and a plurality of tires on the tread tread surface 1.
  • a plurality of circumferential main grooves 2 (four in the illustrated example) partitioned between the circumferential main grooves 2 adjacent to each other in the tread width direction, or by the circumferential main grooves 2 (2a, 2c) and the tread end TE. ) With the land portion 3 (3a, 3b, 3c, 3d).
  • one circumferential main groove 2b is located on the tire equatorial plane CL
  • the other circumferential main grooves 2a and 2c are one of the tread width directions with the tire equatorial plane CL as a boundary, respectively. It is located in one half and the other half.
  • two land portions 3 are arranged in each tread width direction half portion. As shown in the figure, the land portions 3b and 3c are the land portions on the central side in the tread width direction, and the land portions 3a and 3d are the land portions adjacent to the tread end TE.
  • the number of the circumferential main grooves 2 is 3, but it can be 2 or 4 or more. Therefore, the number of land portions 3 can also be three or five or more. Further, in this example, all the land parts are rib-shaped land parts 3, but at least one land part may be a non-rib-shaped land part, that is, a block-shaped land part.
  • the "rib-shaped land portion” means a land portion in which the land portion is not completely divided in the tread circumferential direction by a width direction groove extending in the tread width direction. Therefore, in the present specification, it is a "rib-shaped land portion" even if it is completely divided in the tread circumferential direction by the width direction sipe.
  • the groove width of the circumferential main groove 2 (opening width (opening width measured perpendicular to the extending direction of the groove in a plan view)) is not particularly limited because it depends on the number of the circumferential main grooves 2. For example, it can be 5 to 25 mm.
  • the groove depth (maximum depth) of the circumferential main groove 2 is not particularly limited, but may be, for example, 6 to 18 mm.
  • the circumferential main grooves 2 extend along the tread circumferential direction (without tilting), but at least one circumferential main groove 2 extends around the tread. It may be inclined and extended with respect to the direction, and in that case, it may be inclined and extended at an angle of, for example, 5 ° or less with respect to the tread circumferential direction. Further, in the illustrated example, all of the circumferential main grooves 2 extend straight in the tread circumferential direction, but at least one circumferential main groove 2 has a shape such as a zigzag shape or a curved shape. Is also good.
  • each land portion 3 has a plurality of widthwise grooves 4 extending in the tread width direction.
  • the land portion 3a and 3d adjacent to the tread end TE extend inward in the tread width direction from the tread end TE (rib-shaped in the illustrated example). It has three widthwise grooves 4 terminating in the land portions 3a and 3d within the range shown in the figure.
  • the rib extends outward in the tread width direction from the circumferential main groove 2b located on the tire equatorial plane CL.
  • the groove width of the width direction groove 4 (opening width (opening width measured perpendicular to the extending direction of the groove in a plan view)) is not particularly limited because it depends on the number of width direction grooves 4.
  • each width direction groove 4 extends along the tread width direction (without tilting), but at least one width direction groove 4 extends at a slope with respect to the tread width direction. In this case, it is preferable that the tread extends at an inclination angle of 45 ° or less, and it is preferable that the tread extends at an inclination angle of 30 ° or less. Further, in the illustrated example, each of the width direction grooves 4 extends straight in the tread width direction, but at least one width direction groove 4 may have a bent portion.
  • the width direction groove 4 is preferably opened in the tread end TE or the circumferential main groove 2 as shown in the illustrated example.
  • the width direction groove 4 may not be opened to either the tread end TE or the circumferential main groove 2, and both ends may be terminated within the land portion 3. it can.
  • the width direction groove 4 opens in any of the two circumferential main grooves 2. You may be.
  • each land portion 3 has a plurality of widthwise grooves 4 and does not have sipes.
  • at least one or more land portions 3 may have a sipe in place of the width direction groove 4 or in addition to the width direction groove 4. An embodiment in which the land portion 3 has a sipe will be described later.
  • FIG. 2 is a cross-sectional view schematically showing an example of a groove in the width direction.
  • FIG. 2 is a tread circumferential cross-sectional view of a widthwise groove extending along the tread width direction.
  • FIG. 2 shows a state in which the tire is mounted on the applicable rim, the specified internal pressure is filled, and no load is applied.
  • the width direction groove 4 has a constant groove width (width measured parallel to the tread tread in cross-sectional view) (equal to the opening width in the tread tread 1) on the tread tread 1 side.
  • the groove width is constant portion 4a, and the groove bottom side has a widening portion 4b whose groove width is larger than that of the tread tread surface 1.
  • the widening portion 4b has a circular cross-sectional view and has a maximum width W2 at the center in the tire radial direction.
  • the widening portion 4b can have various shapes, for example, an elliptical cross section (the length in the tire radial direction may be larger or smaller than the length in the tire circumferential direction), or a rectangular shape. And so on.
  • the portion outside the widening portion 4b in the tire radial direction is a groove width constant portion 4a in which the groove width is constant, but this portion may be a portion in which the groove width changes.
  • the groove width W1 of the groove width constant portion 4a is not particularly limited, but can be, for example, 1.0 to 1.5 mm.
  • the maximum width W2 of the widening portion 4b is not particularly limited, but can be, for example, 1.2 to 6.0 mm.
  • the groove depth h of the groove in the width direction is not particularly limited, but can be, for example, 4.0 to 18.0 mm.
  • the groove width at the groove bottom of the width direction groove 4 is preferably larger than 2.5 W1.
  • the extending length h1 of the groove width constant portion 4a in the depth direction is not particularly limited, but may be, for example, 2 to 12 mm.
  • the extending length h2 of the widening portion 4b in the depth direction is not particularly limited, but can be, for example, 1.5 to 8.0 mm.
  • the opening width of the tread tread 1 of the width direction groove 4 (that is, in this example, the sipe).
  • the width of the constant width portion 4a) is W1
  • the outermost groove depth position in the tire radial direction in which the groove width of the widening portion 4 is 2.5 W1 or more is defined as the reference depth position D.
  • the rigidity usually starts to decrease at the time of wear progress.
  • the first tread which is a groove wall surface layer portion which is partitioned by the widening portion 4b and covers at least a part of the widening portion 4b in the tire radial region including at least the reference depth position D.
  • the storage elastic modulus of the rubber G1 is larger than the storage elastic modulus of the second tread rubber G2 in the region surrounding the first tread rubber G1 (specifically, in the present embodiment, the storage elastic modulus of the first tread rubber G1.
  • the storage elastic modulus is 1.5 times or more the storage elastic modulus of the second tread rubber G2).
  • the tire radial region includes at least a region from the reference depth position D to the tire radial position where the widening portion 4b has the maximum width in the tire radial direction, and in this example, the widening portion It is the entire area from the innermost end in the tire radial direction of 4b to the outermost end in the tire radial direction.
  • the first tread rubber G1 covers the widened portion 4b in a shell shape.
  • the first tread rubber G1 is an annular shape having a break in the tread circumferential cross section.
  • the first tread rubber G1 can be an elliptical ring having a break in the tread circumferential cross section.
  • the first tread rubber G1 can be a rectangular annular shape having a break in the tread circumferential cross section.
  • the thickness t in the normal direction of the contour line of the widening portion 4b of the first tread rubber G1 in the cross-sectional view in the tread circumferential direction is 1.0 mm or more. In this example, the thickness t of the first tread rubber G1 is constant.
  • the thickness t of the first tread rubber G1 may vary. In this case, for example, the thickness t of the first tread rubber G1 may be gradually increased or decreased from the inside to the outside in the tire radial direction.
  • the first tread rubber G1 may be present in at least a part of the extending direction of the width direction groove 4 in a plan view, but the entire area in the extending direction of the width direction groove 4 in a plan view. It is preferable that it exists over.
  • the action and effect of the pneumatic tire of the present embodiment will be described.
  • the pneumatic tire of the present embodiment has a plurality of widthwise grooves 4 extending in the tread width direction on the land portion 3, and the widthwise groove 4 has a groove width larger than that of the tread tread 1 side on the groove bottom side. It has a widening portion 4b. As a result, the widened portion 4b having a large groove width is exposed on the tread surface at the time of wear progress, so that the drainage property at the time of wear progress can be improved.
  • the pneumatic tire of the present embodiment is a first groove wall surface layer portion that is partitioned by a widening portion 4b and covers at least a part of the widening portion 4b in a tire radial region including at least a reference depth position D.
  • the storage elastic modulus of the tread rubber G1 is larger than the storage elastic modulus of the second tread rubber G2 in the region surrounding the first tread rubber G1.
  • the tire radial region includes at least a region from the reference depth position D to the tire radial position where the widened portion 4b has the maximum width in the tire radial direction.
  • the drainage property can be improved while further suppressing the occurrence of uneven wear.
  • the tire radial region is the entire area from the innermost end in the tire radial direction to the outermost end in the tire radial direction of the widening portion 4b, the occurrence of uneven wear is further suppressed during wear progress.
  • drainage can be improved.
  • the thickness t in the normal direction of the contour line of the widened portion of the first tread rubber G1 in the cross-sectional view in the tread circumferential direction is 1.0 mm or more, so that when wear progresses, It is possible to improve the drainage property while further suppressing the occurrence of uneven wear.
  • the storage elastic modulus of the first tread rubber G1 is 1.5 times or more the storage elastic modulus of the second tread rubber G2, so that uneven wear occurs at the time of wear progress. It is possible to improve the drainage property while suppressing it in particular.
  • FIG. 3 is a development view schematically showing a tread pattern of a pneumatic tire according to another embodiment of the present invention.
  • the tread pattern shown in FIG. 3 is different from the tread pattern shown in FIG. 1 in that each land portion 3 further has a plurality of widthwise sipes 5 extending in the tread width direction.
  • the circumferential main groove 2, the land portion 3, and the width direction groove 4 in the other embodiment shown in FIG. 3 are the same as those in the one embodiment shown in FIG. 1, including the illustrated configuration and a modification thereof. Therefore, detailed description will be omitted, and the width direction sipes 5 will be mainly described below.
  • each land portion 3 has a plurality of widthwise sipes 5 extending in the tread width direction. Specifically, in this example, in the land portions 3a and 3d adjacent to the tread end TE, the widths extending outward in the tread width direction from each of the circumferential main grooves 2a and 2c and ending in the land portions 3a and 3d. It has three directional sipes 5 in the range shown in the figure. Further, in the land portion 3b and 3c on the central side in the tread width direction, the width direction sipe 5 extending inward in the tread width direction from each of the circumferential main grooves 2a and 2c and terminating within the land portion 3b and 3c is shown in the illustrated range. I have three of them.
  • the number of width direction sipes 5 can be set as appropriate.
  • all the land portions 3 have the width direction sipes 5, but when the tread tread 1 has the width direction sipes 5, any land portion 3 has the width direction sipes 5.
  • the land portion 3 (land portions 3a and 3d in the illustrated example) partitioned by the tread end TE has the width direction sipes 5.
  • the sipe width of the width direction sipe 5 is not particularly limited because it depends on the number of width direction sipes 5. For example, it can be 0.2 to 1.0 mm.
  • the sipe depth (maximum depth) of the width direction sipe 5 is not particularly limited, but can be, for example, 4.0 to 18.0 mm.
  • all the width direction sipes 5 extend along the tread width direction (without tilting), but at least one width direction sipe 5 extends tilted with respect to the tread width direction.
  • the tread it is preferable that the tread extends at an inclination angle of 45 ° or less, and it is preferable that the tread extends at an inclination angle of 30 ° or less.
  • all of the width direction sipes 5 extend straight in the tread width direction, but at least one width direction sipes 5 may have a bent portion.
  • the width direction sipe 5 is preferably opened in the tread end TE or the circumferential main groove 2 as shown in the illustrated example.
  • the width direction sipes 5 may not be opened to either the tread end TE or the circumferential main groove 2, and both ends may be terminated within the land portion 3. it can.
  • the width direction sipe 5 opens in any of the two circumferential main grooves 2. You may be.
  • the width direction grooves 4 and the width direction sipes 5 are arranged alternately when viewed in the tread circumferential direction. As a result, the balance of rigidity of the land portion 3 can be more optimized.
  • it when viewed in the tread circumferential direction, it may have a portion where two or more widthwise grooves 4 are continuously arranged between two widthwise sipes 5 adjacent to each other in the tread circumferential direction. Further, it may have a place where two or more width direction sipes 5 are continuously arranged between two width direction grooves 4 adjacent to each other in the red circumferential direction.
  • the width direction groove 4 and the width direction sipe 5 are both terminated at the center in the tread width direction of the land portion 3, but the width direction groove 4 and the width direction sipe 5 are in the tread circumferential direction. It may have a portion that overlaps when projected, or may be arranged so as not to overlap.
  • FIG. 4 is a cross-sectional view schematically showing an example of a width direction sipe.
  • FIG. 4 is a tread circumferential sectional view of a widthwise sipe extending along the tread width direction.
  • FIG. 4 shows a state in which the tire is mounted on the applicable rim, the specified internal pressure is filled, and no load is applied.
  • the width direction sipe 5 has a constant sipe width (width measured parallel to the tread tread 1 in cross-sectional view) (equal to the opening width at the tread tread 1) on the tread tread 1 side.
  • a certain sipe width constant portion 5a is provided, and a widening portion 5b having a groove width larger than that of the tread tread surface 1 side is provided on the groove bottom side.
  • the widening portion 5b has a circular cross-sectional view and has a maximum width W4 at the center in the tire radial direction.
  • the widening portion 5b can have various shapes, for example, an elliptical cross section (the length in the tire radial direction may be larger or smaller than the length in the tire circumferential direction), or a rectangular shape. And so on.
  • the portion outside the widening portion 5b in the tire radial direction is a groove width constant portion 5a in which the groove width is constant, but this portion may be a portion in which the groove width changes.
  • the sipe width W3 of the sipe width constant portion 5a is not particularly limited, but can be, for example, 0.2 to 1.0 mm.
  • the maximum width W4 of the widening portion 5b is not particularly limited, but can be, for example, 1.2 to 6.0 mm.
  • the sipe depth g of the width direction sipe 5 is not particularly limited, but can be, for example, 4.0 to 18.0 mm.
  • the sipe width at the sipe bottom of the width direction sipe 5 is preferably larger than 2.5 W3.
  • the extending length g1 of the constant sipe width portion 5a in the depth direction is not particularly limited, but may be, for example, 2 to 12 mm.
  • the extending length g2 of the widened portion 5b in the depth direction is not particularly limited, but can be, for example, 1.5 to 8.0 mm.
  • the reference depth position D' The outermost groove depth position in the tire radial direction in which the groove width of 5b is 2.5 W3 or more is defined as the reference depth position D'.
  • the rigidity usually starts to decrease at the time of wear progress. From the viewpoint of manufacturability, it is preferable that the reference depth position D and the reference depth position D'are the same depth, but they can be made different, and the reference depth position D is referred to as the reference depth position D'. It can be larger or smaller.
  • the first groove wall surface layer portion which is partitioned by the widening portion 5b and covers at least a part of the widening portion 5b in the tire radial region including at least the reference depth position D'.
  • the storage elastic modulus of the tread rubber G3 is larger than the storage elastic modulus of the second tread rubber G4 in the region surrounding the first tread rubber G3 (specifically, in the present embodiment, the first tread rubber G3
  • the storage elastic modulus of the second tread rubber G4 is 1.5 times or more the storage elastic modulus of the second tread rubber G4).
  • the tire radial region includes at least a region from the reference depth position D'to the tire radial position where the widening portion 5b has the maximum width in the tire radial direction, and in this example, the widening portion is widened. The entire area from the innermost end in the tire radial direction to the outermost end in the tire radial direction of the portion 5b.
  • the first tread rubber G3 covers the widening portion 5b in a shell shape.
  • the first tread rubber G3 is an annular shape having a break in the tread circumferential cross section.
  • the first tread rubber G3 can be an elliptical ring having a break in the tread circumferential cross section.
  • the first tread rubber G3 can be an annular shape having a break in the tread circumferential cross section.
  • the thickness t in the normal direction of the contour line of the widening portion 5b of the first tread rubber G1 in the cross-sectional view in the tread circumferential direction is 1.0 mm or more.
  • the thickness t of the first tread rubber G1 is constant.
  • the thickness t of the first tread rubber G1 may vary.
  • the thickness t of the first tread rubber G1 may be gradually increased or decreased from the inside to the outside in the tire radial direction.
  • the ratio of the storage elastic modulus of the first tread rubber G3 to the storage elastic modulus of the second tread rubber G4 is the width direction groove 4 from the viewpoint of manufacturability. It is preferable that the ratio is the same as the ratio of the storage elastic modulus of the first tread rubber to the storage elastic modulus of the second tread rubber G2 with respect to the tread rubber for partitioning, but it can be different, and whichever is larger. It may be small.
  • the first tread rubber G3 may be present in at least a part of the extending direction of the width direction sipe 5 in a plan view, but the entire area in the extending direction of the width direction sipe 5 in a plan view. It is preferable that it exists over.
  • the effects of the pneumatic tires of the other embodiments shown in FIGS. 3 and 4 will be described.
  • the circumferential main groove 2, the ribbed land portion 3, and the width direction groove 4 are the same as those of the embodiment shown in FIG. Similar effects can be obtained.
  • the pneumatic tire of the present embodiment shown in FIGS. 3 and 4 has a plurality of widthwise sipes 5 extending in the tread width direction on the land portion 3, and the widthwise sipes 5 are on the bottom side of the sipes. In addition, it has a widening portion 5b in which the sipe width is larger than that on the tread tread 1 side.
  • the pneumatic tire of the embodiment shown in FIGS. 3 and 4 is partitioned by the widening portion 5b at least in the tire radial region including the reference depth position D', and covers at least a part of the widening portion 5b.
  • the storage elastic modulus of the first tread rubber G3, which is the surface layer portion of the groove wall, is larger than the storage elastic modulus of the second tread rubber G4 in the region surrounding the first tread rubber G3.
  • the tire radial region includes at least a region from the reference depth position D'to the tire radial position where the widening portion 5b has the maximum width in the tire radial direction, so that wear progresses. At times, it is possible to improve drainage while further suppressing the occurrence of uneven wear.
  • the tire radial region is the entire area from the innermost end in the tire radial direction to the outermost end in the tire radial direction of the widening portion 5b, so that the occurrence of uneven wear is further suppressed during wear progress.
  • drainage can be improved.
  • the thickness t of the first tread rubber G3 in the normal direction of the contour line of the widened portion in the cross-sectional view in the tread circumferential direction is 1.0 mm or more, so that when wear progresses, It is possible to improve the drainage property while further suppressing the occurrence of uneven wear.
  • the storage elastic modulus of the first tread rubber G3 is 1.5 times or more the storage elastic modulus of the second tread rubber G4, so that uneven wear occurs at the time of wear progress. It is possible to improve the drainage property while suppressing it in particular.
  • FIG. 5 is a development view schematically showing a tread pattern of a pneumatic tire according to another embodiment of the present invention.
  • the tread pattern shown in FIG. 5 is different from the tread pattern shown in FIG. 1 in that each land portion 3 further has a plurality of circumferential sipes 6 extending in the circumferential direction of the tread.
  • the circumferential main groove 2, the land portion 3, and the width direction groove 4 in another embodiment shown in FIG. 5 are the same as those in one embodiment shown in FIG. 1, including the illustrated configuration and a modification thereof. Therefore, detailed description will be omitted, and the circumferential sipe 6 will be mainly described below.
  • each land portion 3 has a plurality of circumferential sipes 6 extending in the circumferential direction of the tread.
  • a circumferential sipe 6 extending in the tread circumferential direction and ending in the land portion 3 at both ends is 4 in the illustrated range.
  • the number of circumferential sipes 6 can be appropriately set.
  • both ends of the circumferential sipe 6 are terminated in the ribbed land portion 3, but the circumferential sipe 6 may be a single circumferential sipe 6 continuously extending in the tread circumferential direction. it can.
  • the land portions 3 have the circumferential sipe 6, but when the tread tread 1 has the circumferential sipe 6, any of the land portions 3 has the circumferential sipe 6. It is preferable that the land portion 3 (land portions 3a and 3d in the illustrated example) partitioned by the tread end TE has a circumferential sipe 6.
  • the sipe width of the circumferential sipe 6 is not particularly limited because it depends on the number of the circumferential sipe 6. For example, it can be 0.2 to 1.5 mm.
  • the sipe depth (maximum depth) of the circumferential sipe 6 is not particularly limited, but may be, for example, 4.0 to 18.0 mm.
  • all the circumferential sipes 6 extend along the tread circumferential direction (without tilting), but at least one circumferential sipe 6 extends inclined with respect to the tread circumferential direction. In this case, it is preferable that the tread extends at an inclination angle of 25 ° or less, and it is preferable that the tread extends at an inclination angle of 10 ° or less.
  • all of the circumferential sipes 6 extend straight in the circumferential direction of the tread, but at least one circumferential sipes 6 may have a bent portion.
  • the width direction groove 4 and the circumferential direction sipe 6 are arranged so as not to overlap when projected in the tread width direction, but are arranged so as to have overlapping portions. You may.
  • FIG. 6 is a cross-sectional view schematically showing an example of a circumferential sipe.
  • FIG. 6 is a tread width direction sectional view of a circumferential sipe extending along the tread circumferential direction.
  • FIG. 6 shows a state in which the tire is mounted on the applicable rim, the specified internal pressure is filled, and no load is applied.
  • the circumferential sipe 6 has a constant sipe width (width measured parallel to the tread tread 1 in cross-sectional view) (equal to the opening width at the tread tread 1) on the tread tread 1 side.
  • a certain sipe width constant portion 6a is provided, and a widening portion 6b having a groove width larger than that of the tread tread 1 side is provided on the groove bottom side.
  • the widening portion 6b has a circular cross-sectional view and has a maximum width W6 at the center in the tire radial direction.
  • the widening portion 6b can have various shapes, for example, an elliptical cross section (the length in the tire radial direction may be larger or smaller than the length in the tire width direction), or a rectangular shape. And so on.
  • the portion of the widening portion 6b from the outside in the tire radial direction is a groove width constant portion 6a in which the groove width is constant, but this portion may be a portion in which the groove width changes.
  • the width W5 of the constant sipe width portion 6a is not particularly limited, but can be, for example, 0.2 to 1.5 mm.
  • the maximum width W6 of the widening portion 6b is not particularly limited, but can be, for example, 1.2 to 6.0 mm.
  • the depth g'of the circumferential sipe 5 is not particularly limited, but can be, for example, 4.0 to 18.0 mm.
  • the sipe width at the sipe bottom of the circumferential sipe 6 is preferably larger than 2.5 W5.
  • the extending length g1'of the constant sipe width portion 6a in the depth direction is not particularly limited, but can be, for example, 2.0 to 12 mm.
  • the extending length g2'in the depth direction of the widened portion 6b is not particularly limited, but can be, for example, 1.5 to 8.0 mm.
  • the reference depth position D ′′ The outermost groove depth position in the tire radial direction in which the groove width of 6b is 2.5 W5 or more is defined as the reference depth position D ′′.
  • the rigidity usually starts to decrease at the time of wear progress.
  • the reference depth position D and the reference depth position D ′′ have the same depth, but they can be made different, and the reference depth position D is referred to as the reference depth position D. It can be larger or smaller than ⁇ ⁇ .
  • the first groove wall surface layer portion which is partitioned by the widening portion 6b and covers at least a part of the widening portion 6b in the tire radial region including at least the reference depth position D ′′.
  • the storage elastic modulus of the tread rubber G5 is larger than the storage elastic modulus of the second tread rubber G6 in the region surrounding the first tread rubber G5 (specifically, in the present embodiment, the first tread rubber).
  • the storage elastic modulus of G5 is 1.5 times or more the storage elastic modulus of the second tread rubber G6).
  • the tire radial region includes at least a region from the reference depth position D ′′ to the tire radial position where the widening portion 6b has the maximum width in the tire radial direction, and in this example, the tire radial region includes a region. The entire area from the innermost end in the tire radial direction to the outermost end in the tire radial direction of the widening portion 6b.
  • the first tread rubber G5 covers the widening portion 5b in a shell shape.
  • the first tread rubber G5 is an annular shape having a break in the tread width direction cross section.
  • the first tread rubber G5 can be an elliptical ring having a break in the cross section in the tread width direction.
  • the first tread rubber G5 can be an annular shape having a break in the cross section in the tread width direction.
  • the thickness t in the normal direction of the contour line of the widening portion 6b of the first tread rubber G5 in the cross-sectional view in the tread width direction is 1.0 mm or more. In this example, the thickness t of the first tread rubber G5 is constant.
  • the thickness t of the first tread rubber G5 may vary. In this case, for example, the thickness t of the first tread rubber G5 can be gradually increased or decreased from the inside to the outside in the tire radial direction.
  • the ratio of the storage elastic modulus of the first tread rubber G5 to the storage elastic modulus of the second tread rubber G6 is the widthwise groove 4 from the viewpoint of manufacturability. It is preferable that the ratio of the storage elastic modulus of the first tread rubber G1 to the storage elastic modulus of the second tread rubber G2 is the same as that of the tread rubber for partitioning the above, but it can be different, and either of them is larger. May be small.
  • the first tread rubber G5 may be present in at least a part of the region in the extending direction of the circumferential sipe 6 in a plan view, but the entire area in the extending direction of the circumferential sipe 6 in a plan view. It is preferable that it exists over.
  • FIGS. 5 and 6 the action and effect of the pneumatic tire of another embodiment shown in FIGS. 5 and 6 will be described.
  • the circumferential main groove 2, the ribbed land portion 3, and the width direction groove 4 are the same as those of the embodiment shown in FIG. Similar effects can be obtained.
  • the pneumatic tire of the present embodiment shown in FIGS. 5 and 6 has one or more circumferential sipes 6 extending in the circumferential direction of the tread on the land portion 3, and the circumferential sipes 6 have a sipe bottom.
  • a widening portion 6b having a sipe width larger than that of the tread tread 1 side is provided on the side.
  • the widened portion 6b having a large sipe width is exposed on the tread surface at the time of progress of wear, so that the drainage property at the time of progress of wear can be improved.
  • the pneumatic tire of the embodiment shown in FIGS. 5 and 6 is partitioned by the widening portion 6b at least in the tire radial region including the reference depth position D ′′, and at least a part of the widening portion 6b is covered.
  • the storage elastic modulus of the first tread rubber G5, which is the surface layer portion of the groove wall covering the groove wall, is larger than the storage elastic modulus of the second tread rubber G6 in the region surrounding the first tread rubber G5.
  • the tire radial region includes at least a region from the reference depth position D ′′ to the tire radial position where the widened portion 6b has the maximum width in the tire radial direction, so that the tire wears.
  • the tire radial region is the entire area from the innermost end of the widening portion 6b in the tire radial direction to the outermost end in the tire radial direction, the occurrence of uneven wear is further suppressed during wear progress.
  • drainage can be improved.
  • the thickness t of the first tread rubber G5 in the normal direction of the contour line of the widened portion in the cross-sectional view in the tread width direction is 1.0 mm or more, so that when wear progresses, It is possible to improve the drainage property while further suppressing the occurrence of uneven wear.
  • the storage elastic modulus of the first tread rubber G5 is 1.5 times or more the storage elastic modulus of the second tread rubber G6, so that uneven wear occurs at the time of wear progress. It is possible to improve the drainage property while suppressing it in particular.
  • the tire radial region includes at least a region from the reference depth position to the tire radial position where the widened portion has the maximum width in the tire radial direction. This is because the drainage property can be improved while further suppressing the occurrence of uneven wear when the wear progresses. Further, it is more preferable that the tire radial region is the entire area from the innermost end in the tire radial direction to the outermost end in the tire radial direction of the widened portion. This is because the drainage property can be improved while further suppressing the occurrence of uneven wear when the wear progresses.
  • the width of the first tread rubber is widened in the cross-sectional view (the tread circumferential cross-sectional view in the examples of FIGS. 1 to 4 and the tread width direction cross-sectional view in the examples of FIGS. 5 and 6).
  • the thickness t of the contour line of the portion in the normal direction is preferably 1.0 mm or more. This is because, by setting the above range, it is possible to improve the drainage property while further suppressing the occurrence of uneven wear at the time of progress of wear. For the same reason, the thickness t is more preferably 1.5 mm or more. On the other hand, the thickness t is preferably 2.0 mm or less so that the rigidity of the land portion does not become too high and the riding comfort is not deteriorated.
  • the storage elastic modulus of the first tread rubber is preferably 1.5 times or more the storage elastic modulus of the second tread rubber. This is because it is possible to improve the drainage property while particularly suppressing the occurrence of uneven wear when the wear progresses. For the same reason, the storage elastic modulus of the first tread rubber is more preferably 1.8 times or more the storage elastic modulus of the second tread rubber. On the other hand, from the viewpoint of preventing the rigidity step from becoming too large, the storage elastic modulus of the first tread rubber is preferably 3.5 times or less the storage elastic modulus of the second tread rubber.
  • a width direction groove having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided. preferable. This is because it is possible to improve the drainage property while suppressing the occurrence of uneven wear, especially in the land portion defined by the tread end at least when the wear progresses. Further, at least in the land portion partitioned by the tread end, a widthwise sipe having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided. preferable.
  • a circumferential sipe having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided.
  • a circumferential sipe having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided.
  • a circumferential sipe having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided.
  • a circumferential sipe having a widening portion using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided.
  • a circumferential sipe having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided.
  • a circumferential sipe having a widening portion (using a first tread rubber having a relatively higher storage elastic modulus than the second tread rubber) may be provided.
  • the width direction groove can be produced, for example, by using a mold having a corresponding shape.
  • the width direction sipe and the circumferential sipe can be manufactured by using, for example, a blade having a corresponding shape.
  • the mold shape corresponding to the vulcanization It can be produced by pulling the tread rubber in the tire depth direction when the tread rubber penetrates the tread rubber.
  • the widthwise groove 4 has the shape shown in FIG. 2, and the widthwise sipe 5 has the shape shown in FIG.
  • the width direction groove 4 may be a groove having a U-shaped cross section and a V-shaped cross section, and the width direction sipe 5 may have the shape shown in FIG.
  • the widthwise groove 4 has the shape shown in FIG. 2 and the circumferential sipe 6 has the shape shown in FIG.
  • the widthwise groove 4 may be a groove having a U-shaped cross section and a V-shaped cross section
  • the circumferential sipe 6 may have the shape shown in FIG.
  • the land portion has a width direction groove, but the land portion does not have a width direction groove, and one of the land portions has a width direction sipe and a width direction groove.
  • it may be configured to have only a circumferential sipe.
  • the arrangement of the width direction sipe and / or the circumferential sipe, the sipe width, the sipe depth, the shape, and the like can be the same as those described for the embodiments shown in FIGS. 3 to 6.
  • the land portion has a plurality of widthwise sipes extending in the tread width direction, and the widthwise sipes have a widening portion on the bottom side of the sipe whose sipe width is larger than that of the tread tread side, and at least the reference depth.
  • the storage elasticity of the first tread rubber which is a groove wall surface layer portion that is partitioned by the widening portion and covers at least a part of the widening portion, is such that the storage elasticity of the first tread rubber is around the first tread rubber.
  • a first groove wall surface layer portion that has a widening portion that is larger than the tread tread side, is partitioned by the widening portion at least in the tire radial region including the reference depth position, and covers at least a part of the widening portion.
  • the storage elasticity of the tread rubber can be larger than the storage elasticity of the second tread rubber in the region surrounding the first tread rubber. Further, unlike the configurations shown in FIGS.
  • a configuration may be configured in which the width direction groove is provided or not provided, and both the width direction sipe and the circumferential sipe are provided.
  • the width direction sipe and the circumferential sipe may or may not intersect.
  • the sipe bottom side has a widening portion in which the sipe width is larger than that of the tread tread side, and at least in the tire radial region including the reference depth position.
  • the storage elastic modulus of the first tread rubber which is the surface layer of the groove wall that is partitioned by the widening portion and covers at least a part of the widening portion, is the storage elastic modulus of the second tread rubber in the region surrounding the first tread rubber.
  • the tread tread may have at least one of the width direction groove, the width direction sipe, and the circumferential direction sipe. Then, in any one or more of the width direction groove, the width direction sipe, and the circumferential direction sipe, a widening portion having a groove width (sipe width) larger than that of the tread tread side is provided on the groove bottom side (sipe bottom side).
  • the storage elastic modulus of the first tread rubber which is a groove wall surface layer portion that is partitioned by the widening portion and covers at least a part of the widening portion, is defined in the tire radial region including at least the reference depth position.
  • the configuration may be larger than the storage elastic modulus of the second tread rubber in the region around the tread rubber of 1.
  • the reference depth position D, the reference depth position D ′, and the reference depth position D ′′ have the same depth, but they can be different from each other.
  • the magnitude relationship between the reference depth position D, the reference depth position D ′, and the reference depth position D ′′ does not matter.
  • the pneumatic tire of the present invention is particularly preferably used as a tire for passenger cars and a tire for heavy loads (particularly a tire for trucks and buses).

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Abstract

La présente invention concerne un pneumatique qui comprend, sur une surface de bande de roulement de ce dernier : une pluralité de rainures principales de direction circonférentielle, qui s'étendent dans une direction circonférentielle de bande de roulement ; et une pluralité de parties d'appui, qui sont délimitées entre les rainures principales de direction circonférentielle adjacentes dans un sens de la largeur de bande de roulement parmi la pluralité de rainures principales de direction circonférentielle, ou qui sont délimitées par les rainures principales de direction circonférentielle et une extrémité de bande de roulement. Une rainure dans le sens de la largeur (lamelle dans le sens de la largeur) (lamelle de direction circonférentielle) comprend une partie large sur le côté plancher de rainure (côté plancher de lamelle) dans laquelle la largeur de rainure (largeur de lamelle) est supérieure à celle sur le côté surface de bande de roulement. Dans une région de direction radiale de pneu qui comprend au moins une position de profondeur de référence, le module d'élasticité de stockage d'un premier caoutchouc de bande de roulement, qui est une partie de couche de surface de paroi de rainure qui est délimitée par la partie large et recouvre au moins partiellement la partie large, est supérieur au module d'élasticité de stockage d'un second caoutchouc de bande de roulement dans une région sur la périphérie du premier caoutchouc de bande de roulement.
PCT/JP2020/021000 2019-06-14 2020-05-27 Pneumatique WO2020250688A1 (fr)

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US17/612,523 US20220227176A1 (en) 2019-06-14 2020-05-27 Pneumatic tire
EP20822945.0A EP3984770A4 (fr) 2019-06-14 2020-05-27 Pneumatique

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JP2002114010A (ja) * 2000-10-10 2002-04-16 Bridgestone Corp 空気入りタイヤ
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